doc: uart rs485 fix incorrect sch circuit label

docs/en/api-reference/peripherals/uart.rst

@@ -353,7 +353,7 @@ Circuit C: Auto Switching Transmitter/Receiver
    VCC1 <-------------------+-----------+           +-------------------+----> VCC2
                  10K ____   |           |           |                   |
                 +---|____|--+       +---x-----------x---+    10K ____   |
-                |                   |                   |   +---|____|--+ GND2
+                |                   |                   |   +---|____|--+
   RX <----------+-------------------| RXD               |   | 
                      10K ____       |                  A|---+---------------<> A (+)
                 +-------|____|------| PV    ADM2483     |   |    ____  120
@@ -363,7 +363,7 @@ Circuit C: Auto Switching Transmitter/Receiver
                         ---+    +-->| /RE               |   |    ____
            10K          |       |   |                   |   +---|____|---+
           ____       | /-C      +---| TXD               |    10K         |
-  TX >---|____|--B___|/   NPN   |   |                   |                |
+  TX >---|____|--+_B_|/   NPN   |   |                   |                |
                      |\         |   +---x-----------x---+                |
                      | \-E      |       |           |                    |
                         |       |       |           |                    |